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Subsequent Events (Details) - Common Stock [Member] - Dutch Auction [Member] - Subsequent Event [Member] $ / shares in Units, $ in Millions	Nov. 24, 2015 USD ($) $ / shares shares
Subsequent Event [Line Items]
Common stock authorized for repurchase (in shares) | shares	7,317,073
Stock repurchased during period, value | $	$ 300.0
Maximum [Member]
Subsequent Event [Line Items]
Tender offer, share offer price	$ 41.00
Minimum [Member]
Subsequent Event [Line Items]
Tender offer, share offer price	$ 38.00

X

- Definition

Stock Repurchase Program, Share Offer Price

+ References

No definition available.

+ Details

Name:	cprt_StockRepurchaseProgramShareOfferPrice
Namespace Prefix:	cprt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareRepurchaseProgramAxis=cprt_DutchAuctionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: